I just upgraded a yealink SIP-T22P to firmware ver. 220.127.116.11. the problem i ran into was the phone can only call out, when you try to dial its extension it says the person is unavailable even tho its registered properly. I compared all the settings with another phone with older firmware to make sure any settings didn't change with the upgrade, but they were set the same. thinking it might be a bug in the firmware i tested this same phone on a online hosted freePBX system and it worked fine. has anyone run into this issue or know what could be happening.